Enhancement of superhorizon scale inflationary curvature perturbations

Details Enhancement of superhorizon scale inflationary curvature perturbations Enhancement of superhorizon scale inflationary curvature perturbations

2001-01-23

arxiv.org/abs/astro-ph/0101406v2

Phys.Rev.D64:023512,2001

Astronomy and Astrophysics

Astrophysics

5 pages RevTeX file with 2 figures incorporated v2:Contains important O(k^2) correction

Scientific paper

10.1103/PhysRevD.64.023512

We show that there exists a simple mechanism which can enhance the amplitude of curvature perturbations on superhorizon scales during inflation, relative to their amplitude at horizon crossing. The enhancement may occur even in a single-field inflaton model, and occurs if the quantity $a\dot\phi/H$ becomes sufficiently small, as compared to its value at horizon crossing, for some time interval during inflation. We give a criterion for this enhancement in general single-field inflation models.

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